Burgum seems like a decent, competent, knowledgeable guy...but he’s a quiet personality that gets lost in the wash. Lots of positions he could probably do well, but broadly campaigning alongside a presidential candidate doesn’t seem to be one of them.
I think a lot of people who are reacting with “He’s boring”, etc. haven’t seen very much of him. Did you watch his speech in New Jersey this weekend? He’s actually a pretty decent speaker and just as importantly, does not come across as insincere like Mike Pence did.